I have used this device for few days, this device was great upgrade over the iphone4s, apple is famous for their great hardware and software optimisation and also has got all new update that is ios 9 which is best in class, in my day todays usage I didnt find any lag and hang, the camera is quite aweome and this device has got great looks and design as compared to the 4s which was just 3.5 inch in size, 4 inch device is great fit, I have played some games on the device the device is smooth in performance one that will dissappoint you is the battery you have to charge twice a day and no sd card may be a drawback